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Satellite Link Budget Calculator

 The following tools are available at

  1. Link budget calculator
  2. Earth station pointing angle calculator

The Link budget calculator is an online tool, that provides different link budgeting calculations. Given below are the parameters that you need to provide, and the resulting values after computations. The results provided are given in green color.

 1. Calculation of uplink path loss

        Uplink frequency GHz 

        Range (35778 - 41679) km 

          You get:

          Uplink path loss dB 

 2. Calculation of transmitting antenna gain

       Uplink antenna diameter m 

       Uplink antenna aperture efficiency e.g. 0.65 

      You get:

      Uplink antenna transmit gain dBi

 3. Calculation of transmit EIRP & operating flux dencity

        Transmit power per carrier(W) 

        Transmitter feader losses(dB) 

        Antenna pointing loss 

        No of carriers 

        Amplifier back off 

        You get:

         Transmit  EIRP dBW 

         Uplink pfd at satellite dBW/m^2 

         Power rating of ground transmitter

 4. Calculation of uplink to noise ratio

        Up link rain attenuation 

        Satellite uplink G/T dB/K 

       You get:

        Uplink C/N dB

 5. Calculation of satellite operating down link eirp

        Saturated EIRP (dB W) 

        Saturated EIRP (watts) 

        Saturation FD (dB/sq.m) 

        Output back off (dB0 

        In put back off (dB)  

        You get:

         Satellite operating downlink  EIRP dBW 

        Satellite operating down link EIRP (watts)

 6. Calculation of satellite operating band width

        Input data rate(Kb/S) 

        Link overhead factor(%)(worst case) 

        FEC rate coding 

        Bits/symbol (m)

        You get:

        Effective in put data rate 

        Transmission rate 

        Bandwidth Hz

 7. Calculation of down link path loss

        Downlink frequency GHz 

       You get:

       Downlink path loss dB

 8. Calculation of receiver antenna gain

        Downlink receive antenna diameter m 

        Downlink receive antenna aperture efficiency e.g. 0.65 

       You get:

        Downlink receive antenna gain dBi

 9. Calculation of reciver G/T

       Antenna elevation angle(deg) 

       Antenna noise temp(K) 

       Increase in noise temperature due to rain(K) 

       LNA noise temp (K) 

      You get:

       System noise temp(k) 

       Downlink receive antenna G/T dB/K

 10. Calculation of link margin

       Down link rain attenuation (dB) 

       Receive antenna pointing loss(dB) 

       Eb/No Required for BER of 1/10^7 

       You get:

        Downlink C/N (dB Hz) 

       Overall down-link C/No [dB Hz] 

       Available Eb/No

 And finally, the available link margin

 2. Pointing angles calculator: The earth station pointing angle calculator is a simple look angle calculator. You input the longitude and latitude of an earth station location, the program computes the azimuth and elevation of the satellite earth station.

 PS: The calculators are provided as a guide only, and or the author assumes no responsibility for the correctness of the computations or data.

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